arch/arm/plat-omap/dmtimer.c

   1 /*
   2  * linux/arch/arm/plat-omap/dmtimer.c
   3  *
   4  * OMAP Dual-Mode Timers
   5  *
   6  * Copyright (C) 2005 Nokia Corporation
   7  * OMAP2 support by Juha Yrjola
   8  * API improvements and OMAP2 clock framework support by Timo Teras
   9  *
  10  * Copyright (C) 2009 Texas Instruments
  11  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
  12  *
  13  * This program is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU General Public License as published by the
  15  * Free Software Foundation; either version 2 of the License, or (at your
  16  * option) any later version.
  17  *
  18  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  19  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  20  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
  21  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  *
  27  * You should have received a copy of the  GNU General Public License along
  28  * with this program; if not, write  to the Free Software Foundation, Inc.,
  29  * 675 Mass Ave, Cambridge, MA 02139, USA.
  30  */
  31
  32 #include <linux/init.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/errno.h>
  35 #include <linux/list.h>
  36 #include <linux/clk.h>
  37 #include <linux/delay.h>
  38 #include <linux/io.h>
  39 #include <linux/module.h>
  40 #include <mach/hardware.h>
  41 #include <plat/dmtimer.h>
  42 #include <mach/irqs.h>
  43
  44 /* register offsets */
  45 #define _OMAP_TIMER_ID_OFFSET           0x00
  46 #define _OMAP_TIMER_OCP_CFG_OFFSET      0x10
  47 #define _OMAP_TIMER_SYS_STAT_OFFSET     0x14
  48 #define _OMAP_TIMER_STAT_OFFSET         0x18
  49 #define _OMAP_TIMER_INT_EN_OFFSET       0x1c
  50 #define _OMAP_TIMER_WAKEUP_EN_OFFSET    0x20
  51 #define _OMAP_TIMER_CTRL_OFFSET         0x24
  52 #define         OMAP_TIMER_CTRL_GPOCFG          (1 << 14)
  53 #define         OMAP_TIMER_CTRL_CAPTMODE        (1 << 13)
  54 #define         OMAP_TIMER_CTRL_PT              (1 << 12)
  55 #define         OMAP_TIMER_CTRL_TCM_LOWTOHIGH   (0x1 << 8)
  56 #define         OMAP_TIMER_CTRL_TCM_HIGHTOLOW   (0x2 << 8)
  57 #define         OMAP_TIMER_CTRL_TCM_BOTHEDGES   (0x3 << 8)
  58 #define         OMAP_TIMER_CTRL_SCPWM           (1 << 7)
  59 #define         OMAP_TIMER_CTRL_CE              (1 << 6) /* compare enable */
  60 #define         OMAP_TIMER_CTRL_PRE             (1 << 5) /* prescaler enable */
  61 #define         OMAP_TIMER_CTRL_PTV_SHIFT       2 /* prescaler value shift */
  62 #define         OMAP_TIMER_CTRL_POSTED          (1 << 2)
  63 #define         OMAP_TIMER_CTRL_AR              (1 << 1) /* auto-reload enable */
  64 #define         OMAP_TIMER_CTRL_ST              (1 << 0) /* start timer */
  65 #define _OMAP_TIMER_COUNTER_OFFSET      0x28
  66 #define _OMAP_TIMER_LOAD_OFFSET         0x2c
  67 #define _OMAP_TIMER_TRIGGER_OFFSET      0x30
  68 #define _OMAP_TIMER_WRITE_PEND_OFFSET   0x34
  69 #define         WP_NONE                 0       /* no write pending bit */
  70 #define         WP_TCLR                 (1 << 0)
  71 #define         WP_TCRR                 (1 << 1)
  72 #define         WP_TLDR                 (1 << 2)
  73 #define         WP_TTGR                 (1 << 3)
  74 #define         WP_TMAR                 (1 << 4)
  75 #define         WP_TPIR                 (1 << 5)
  76 #define         WP_TNIR                 (1 << 6)
  77 #define         WP_TCVR                 (1 << 7)
  78 #define         WP_TOCR                 (1 << 8)
  79 #define         WP_TOWR                 (1 << 9)
  80 #define _OMAP_TIMER_MATCH_OFFSET        0x38
  81 #define _OMAP_TIMER_CAPTURE_OFFSET      0x3c
  82 #define _OMAP_TIMER_IF_CTRL_OFFSET      0x40
  83 #define _OMAP_TIMER_CAPTURE2_OFFSET             0x44    /* TCAR2, 34xx only */
  84 #define _OMAP_TIMER_TICK_POS_OFFSET             0x48    /* TPIR, 34xx only */
  85 #define _OMAP_TIMER_TICK_NEG_OFFSET             0x4c    /* TNIR, 34xx only */
  86 #define _OMAP_TIMER_TICK_COUNT_OFFSET           0x50    /* TCVR, 34xx only */
  87 #define _OMAP_TIMER_TICK_INT_MASK_SET_OFFSET    0x54    /* TOCR, 34xx only */
  88 #define _OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET  0x58    /* TOWR, 34xx only */
  89
  90 /* register offsets with the write pending bit encoded */
  91 #define WPSHIFT                                 16
  92
  93 #define OMAP_TIMER_ID_REG                       (_OMAP_TIMER_ID_OFFSET \
  94                                                         | (WP_NONE << WPSHIFT))
  95
  96 #define OMAP_TIMER_OCP_CFG_REG                  (_OMAP_TIMER_OCP_CFG_OFFSET \
  97                                                         | (WP_NONE << WPSHIFT))
  98
  99 #define OMAP_TIMER_SYS_STAT_REG                 (_OMAP_TIMER_SYS_STAT_OFFSET \
 100                                                         | (WP_NONE << WPSHIFT))
 101
 102 #define OMAP_TIMER_STAT_REG                     (_OMAP_TIMER_STAT_OFFSET \
 103                                                         | (WP_NONE << WPSHIFT))
 104
 105 #define OMAP_TIMER_INT_EN_REG                   (_OMAP_TIMER_INT_EN_OFFSET \
 106                                                         | (WP_NONE << WPSHIFT))
 107
 108 #define OMAP_TIMER_WAKEUP_EN_REG                (_OMAP_TIMER_WAKEUP_EN_OFFSET \
 109                                                         | (WP_NONE << WPSHIFT))
 110
 111 #define OMAP_TIMER_CTRL_REG                     (_OMAP_TIMER_CTRL_OFFSET \
 112                                                         | (WP_TCLR << WPSHIFT))
 113
 114 #define OMAP_TIMER_COUNTER_REG                  (_OMAP_TIMER_COUNTER_OFFSET \
 115                                                         | (WP_TCRR << WPSHIFT))
 116
 117 #define OMAP_TIMER_LOAD_REG                     (_OMAP_TIMER_LOAD_OFFSET \
 118                                                         | (WP_TLDR << WPSHIFT))
 119
 120 #define OMAP_TIMER_TRIGGER_REG                  (_OMAP_TIMER_TRIGGER_OFFSET \
 121                                                         | (WP_TTGR << WPSHIFT))
 122
 123 #define OMAP_TIMER_WRITE_PEND_REG               (_OMAP_TIMER_WRITE_PEND_OFFSET \
 124                                                         | (WP_NONE << WPSHIFT))
 125
 126 #define OMAP_TIMER_MATCH_REG                    (_OMAP_TIMER_MATCH_OFFSET \
 127                                                         | (WP_TMAR << WPSHIFT))
 128
 129 #define OMAP_TIMER_CAPTURE_REG                  (_OMAP_TIMER_CAPTURE_OFFSET \
 130                                                         | (WP_NONE << WPSHIFT))
 131
 132 #define OMAP_TIMER_IF_CTRL_REG                  (_OMAP_TIMER_IF_CTRL_OFFSET \
 133                                                         | (WP_NONE << WPSHIFT))
 134
 135 #define OMAP_TIMER_CAPTURE2_REG                 (_OMAP_TIMER_CAPTURE2_OFFSET \
 136                                                         | (WP_NONE << WPSHIFT))
 137
 138 #define OMAP_TIMER_TICK_POS_REG                 (_OMAP_TIMER_TICK_POS_OFFSET \
 139                                                         | (WP_TPIR << WPSHIFT))
 140
 141 #define OMAP_TIMER_TICK_NEG_REG                 (_OMAP_TIMER_TICK_NEG_OFFSET \
 142                                                         | (WP_TNIR << WPSHIFT))
 143
 144 #define OMAP_TIMER_TICK_COUNT_REG               (_OMAP_TIMER_TICK_COUNT_OFFSET \
 145                                                         | (WP_TCVR << WPSHIFT))
 146
 147 #define OMAP_TIMER_TICK_INT_MASK_SET_REG                                \
 148                 (_OMAP_TIMER_TICK_INT_MASK_SET_OFFSET | (WP_TOCR << WPSHIFT))
 149
 150 #define OMAP_TIMER_TICK_INT_MASK_COUNT_REG                              \
 151                 (_OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET | (WP_TOWR << WPSHIFT))
 152
 153 struct omap_dm_timer {
 154         unsigned long phys_base;
 155         int irq;
 156 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) || \
 157                         defined(CONFIG_ARCH_OMAP4)
 158         struct clk *iclk, *fclk;
 159 #endif
 160         void __iomem *io_base;
 161         unsigned reserved:1;
 162         unsigned enabled:1;
 163         unsigned posted:1;
 164 };
 165
 166 #ifdef CONFIG_ARCH_OMAP1
 167
 168 #define omap_dm_clk_enable(x)
 169 #define omap_dm_clk_disable(x)
 170 #define omap2_dm_timers                 NULL
 171 #define omap2_dm_source_names           NULL
 172 #define omap2_dm_source_clocks          NULL
 173 #define omap3_dm_timers                 NULL
 174 #define omap3_dm_source_names           NULL
 175 #define omap3_dm_source_clocks          NULL
 176 #define omap4_dm_timers                 NULL
 177 #define omap4_dm_source_names           NULL
 178 #define omap4_dm_source_clocks          NULL
 179
 180 static struct omap_dm_timer omap1_dm_timers[] = {
 181         { .phys_base = 0xfffb1400, .irq = INT_1610_GPTIMER1 },
 182         { .phys_base = 0xfffb1c00, .irq = INT_1610_GPTIMER2 },
 183         { .phys_base = 0xfffb2400, .irq = INT_1610_GPTIMER3 },
 184         { .phys_base = 0xfffb2c00, .irq = INT_1610_GPTIMER4 },
 185         { .phys_base = 0xfffb3400, .irq = INT_1610_GPTIMER5 },
 186         { .phys_base = 0xfffb3c00, .irq = INT_1610_GPTIMER6 },
 187         { .phys_base = 0xfffb7400, .irq = INT_1610_GPTIMER7 },
 188         { .phys_base = 0xfffbd400, .irq = INT_1610_GPTIMER8 },
 189 };
 190
 191 static const int dm_timer_count = ARRAY_SIZE(omap1_dm_timers);
 192
 193 #elif defined(CONFIG_ARCH_OMAP2)
 194
 195 #define omap_dm_clk_enable(x)           clk_enable(x)
 196 #define omap_dm_clk_disable(x)          clk_disable(x)
 197 #define omap1_dm_timers                 NULL
 198 #define omap3_dm_timers                 NULL
 199 #define omap3_dm_source_names           NULL
 200 #define omap3_dm_source_clocks          NULL
 201 #define omap4_dm_timers                 NULL
 202 #define omap4_dm_source_names           NULL
 203 #define omap4_dm_source_clocks          NULL
 204
 205 static struct omap_dm_timer omap2_dm_timers[] = {
 206         { .phys_base = 0x48028000, .irq = INT_24XX_GPTIMER1 },
 207         { .phys_base = 0x4802a000, .irq = INT_24XX_GPTIMER2 },
 208         { .phys_base = 0x48078000, .irq = INT_24XX_GPTIMER3 },
 209         { .phys_base = 0x4807a000, .irq = INT_24XX_GPTIMER4 },
 210         { .phys_base = 0x4807c000, .irq = INT_24XX_GPTIMER5 },
 211         { .phys_base = 0x4807e000, .irq = INT_24XX_GPTIMER6 },
 212         { .phys_base = 0x48080000, .irq = INT_24XX_GPTIMER7 },
 213         { .phys_base = 0x48082000, .irq = INT_24XX_GPTIMER8 },
 214         { .phys_base = 0x48084000, .irq = INT_24XX_GPTIMER9 },
 215         { .phys_base = 0x48086000, .irq = INT_24XX_GPTIMER10 },
 216         { .phys_base = 0x48088000, .irq = INT_24XX_GPTIMER11 },
 217         { .phys_base = 0x4808a000, .irq = INT_24XX_GPTIMER12 },
 218 };
 219
 220 static const char *omap2_dm_source_names[] __initdata = {
 221         "sys_ck",
 222         "func_32k_ck",
 223         "alt_ck",
 224         NULL
 225 };
 226
 227 static struct clk *omap2_dm_source_clocks[3];
 228 static const int dm_timer_count = ARRAY_SIZE(omap2_dm_timers);
 229
 230 #elif defined(CONFIG_ARCH_OMAP3)
 231
 232 #define omap_dm_clk_enable(x)           clk_enable(x)
 233 #define omap_dm_clk_disable(x)          clk_disable(x)
 234 #define omap1_dm_timers                 NULL
 235 #define omap2_dm_timers                 NULL
 236 #define omap2_dm_source_names           NULL
 237 #define omap2_dm_source_clocks          NULL
 238 #define omap4_dm_timers                 NULL
 239 #define omap4_dm_source_names           NULL
 240 #define omap4_dm_source_clocks          NULL
 241
 242 static struct omap_dm_timer omap3_dm_timers[] = {
 243         { .phys_base = 0x48318000, .irq = INT_24XX_GPTIMER1 },
 244         { .phys_base = 0x49032000, .irq = INT_24XX_GPTIMER2 },
 245         { .phys_base = 0x49034000, .irq = INT_24XX_GPTIMER3 },
 246         { .phys_base = 0x49036000, .irq = INT_24XX_GPTIMER4 },
 247         { .phys_base = 0x49038000, .irq = INT_24XX_GPTIMER5 },
 248         { .phys_base = 0x4903A000, .irq = INT_24XX_GPTIMER6 },
 249         { .phys_base = 0x4903C000, .irq = INT_24XX_GPTIMER7 },
 250         { .phys_base = 0x4903E000, .irq = INT_24XX_GPTIMER8 },
 251         { .phys_base = 0x49040000, .irq = INT_24XX_GPTIMER9 },
 252         { .phys_base = 0x48086000, .irq = INT_24XX_GPTIMER10 },
 253         { .phys_base = 0x48088000, .irq = INT_24XX_GPTIMER11 },
 254         { .phys_base = 0x48304000, .irq = INT_34XX_GPT12_IRQ },
 255 };
 256
 257 static const char *omap3_dm_source_names[] __initdata = {
 258         "sys_ck",
 259         "omap_32k_fck",
 260         NULL
 261 };
 262
 263 static struct clk *omap3_dm_source_clocks[2];
 264 static const int dm_timer_count = ARRAY_SIZE(omap3_dm_timers);
 265
 266 #elif defined(CONFIG_ARCH_OMAP4)
 267
 268 #define omap_dm_clk_enable(x)           clk_enable(x)
 269 #define omap_dm_clk_disable(x)          clk_disable(x)
 270 #define omap1_dm_timers                 NULL
 271 #define omap2_dm_timers                 NULL
 272 #define omap2_dm_source_names           NULL
 273 #define omap2_dm_source_clocks          NULL
 274 #define omap3_dm_timers                 NULL
 275 #define omap3_dm_source_names           NULL
 276 #define omap3_dm_source_clocks          NULL
 277
 278 static struct omap_dm_timer omap4_dm_timers[] = {
 279         { .phys_base = 0x4a318000, .irq = INT_44XX_GPTIMER1 },
 280         { .phys_base = 0x48032000, .irq = INT_44XX_GPTIMER2 },
 281         { .phys_base = 0x48034000, .irq = INT_44XX_GPTIMER3 },
 282         { .phys_base = 0x48036000, .irq = INT_44XX_GPTIMER4 },
 283         { .phys_base = 0x40138000, .irq = INT_44XX_GPTIMER5 },
 284         { .phys_base = 0x4013a000, .irq = INT_44XX_GPTIMER6 },
 285         { .phys_base = 0x4013a000, .irq = INT_44XX_GPTIMER7 },
 286         { .phys_base = 0x4013e000, .irq = INT_44XX_GPTIMER8 },
 287         { .phys_base = 0x4803e000, .irq = INT_44XX_GPTIMER9 },
 288         { .phys_base = 0x48086000, .irq = INT_44XX_GPTIMER10 },
 289         { .phys_base = 0x48088000, .irq = INT_44XX_GPTIMER11 },
 290         { .phys_base = 0x4a320000, .irq = INT_44XX_GPTIMER12 },
 291 };
 292 static const char *omap4_dm_source_names[] __initdata = {
 293         "sys_ck",
 294         "omap_32k_fck",
 295         NULL
 296 };
 297 static struct clk *omap4_dm_source_clocks[2];
 298 static const int dm_timer_count = ARRAY_SIZE(omap4_dm_timers);
 299
 300 #else
 301
 302 #error OMAP architecture not supported!
 303
 304 #endif
 305
 306 static struct omap_dm_timer *dm_timers;
 307 static const char **dm_source_names;
 308 static struct clk **dm_source_clocks;
 309
 310 static spinlock_t dm_timer_lock;
 311
 312 /*
 313  * Reads timer registers in posted and non-posted mode. The posted mode bit
 314  * is encoded in reg. Note that in posted mode write pending bit must be
 315  * checked. Otherwise a read of a non completed write will produce an error.
 316  */
 317 static inline u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, u32 reg)
 318 {
 319         if (timer->posted)
 320                 while (readl(timer->io_base + (OMAP_TIMER_WRITE_PEND_REG & 0xff))
 321                                 & (reg >> WPSHIFT))
 322                         cpu_relax();
 323         return readl(timer->io_base + (reg & 0xff));
 324 }
 325
 326 /*
 327  * Writes timer registers in posted and non-posted mode. The posted mode bit
 328  * is encoded in reg. Note that in posted mode the write pending bit must be
 329  * checked. Otherwise a write on a register which has a pending write will be
 330  * lost.
 331  */
 332 static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, u32 reg,
 333                                                 u32 value)
 334 {
 335         if (timer->posted)
 336                 while (readl(timer->io_base + (OMAP_TIMER_WRITE_PEND_REG & 0xff))
 337                                 & (reg >> WPSHIFT))
 338                         cpu_relax();
 339         writel(value, timer->io_base + (reg & 0xff));
 340 }
 341
 342 static void omap_dm_timer_wait_for_reset(struct omap_dm_timer *timer)
 343 {
 344         int c;
 345
 346         c = 0;
 347         while (!(omap_dm_timer_read_reg(timer, OMAP_TIMER_SYS_STAT_REG) & 1)) {
 348                 c++;
 349                 if (c > 100000) {
 350                         printk(KERN_ERR "Timer failed to reset\n");
 351                         return;
 352                 }
 353         }
 354 }
 355
 356 static void omap_dm_timer_reset(struct omap_dm_timer *timer)
 357 {
 358         u32 l;
 359
 360         if (!cpu_class_is_omap2() || timer != &dm_timers[0]) {
 361                 omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06);
 362                 omap_dm_timer_wait_for_reset(timer);
 363         }
 364         omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ);
 365
 366         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_OCP_CFG_REG);
 367         l |= 0x02 << 3;  /* Set to smart-idle mode */
 368         l |= 0x2 << 8;   /* Set clock activity to perserve f-clock on idle */
 369
 370         /*
 371          * Enable wake-up on OMAP2 CPUs.
 372          */
 373         if (cpu_class_is_omap2())
 374                 l |= 1 << 2;
 375         omap_dm_timer_write_reg(timer, OMAP_TIMER_OCP_CFG_REG, l);
 376
 377         /* Match hardware reset default of posted mode */
 378         omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG,
 379                         OMAP_TIMER_CTRL_POSTED);
 380         timer->posted = 1;
 381 }
 382
 383 static void omap_dm_timer_prepare(struct omap_dm_timer *timer)
 384 {
 385         omap_dm_timer_enable(timer);
 386         omap_dm_timer_reset(timer);
 387 }
 388
 389 struct omap_dm_timer *omap_dm_timer_request(void)
 390 {
 391         struct omap_dm_timer *timer = NULL;
 392         unsigned long flags;
 393         int i;
 394
 395         spin_lock_irqsave(&dm_timer_lock, flags);
 396         for (i = 0; i < dm_timer_count; i++) {
 397                 if (dm_timers[i].reserved)
 398                         continue;
 399
 400                 timer = &dm_timers[i];
 401                 timer->reserved = 1;
 402                 break;
 403         }
 404         spin_unlock_irqrestore(&dm_timer_lock, flags);
 405
 406         if (timer != NULL)
 407                 omap_dm_timer_prepare(timer);
 408
 409         return timer;
 410 }
 411 EXPORT_SYMBOL_GPL(omap_dm_timer_request);
 412
 413 struct omap_dm_timer *omap_dm_timer_request_specific(int id)
 414 {
 415         struct omap_dm_timer *timer;
 416         unsigned long flags;
 417
 418         spin_lock_irqsave(&dm_timer_lock, flags);
 419         if (id <= 0 || id > dm_timer_count || dm_timers[id-1].reserved) {
 420                 spin_unlock_irqrestore(&dm_timer_lock, flags);
 421                 printk("BUG: warning at %s:%d/%s(): unable to get timer %d\n",
 422                        __FILE__, __LINE__, __func__, id);
 423                 dump_stack();
 424                 return NULL;
 425         }
 426
 427         timer = &dm_timers[id-1];
 428         timer->reserved = 1;
 429         spin_unlock_irqrestore(&dm_timer_lock, flags);
 430
 431         omap_dm_timer_prepare(timer);
 432
 433         return timer;
 434 }
 435 EXPORT_SYMBOL_GPL(omap_dm_timer_request_specific);
 436
 437 void omap_dm_timer_free(struct omap_dm_timer *timer)
 438 {
 439         omap_dm_timer_enable(timer);
 440         omap_dm_timer_reset(timer);
 441         omap_dm_timer_disable(timer);
 442
 443         WARN_ON(!timer->reserved);
 444         timer->reserved = 0;
 445 }
 446 EXPORT_SYMBOL_GPL(omap_dm_timer_free);
 447
 448 void omap_dm_timer_enable(struct omap_dm_timer *timer)
 449 {
 450         if (timer->enabled)
 451                 return;
 452
 453         omap_dm_clk_enable(timer->fclk);
 454         omap_dm_clk_enable(timer->iclk);
 455
 456         timer->enabled = 1;
 457 }
 458 EXPORT_SYMBOL_GPL(omap_dm_timer_enable);
 459
 460 void omap_dm_timer_disable(struct omap_dm_timer *timer)
 461 {
 462         if (!timer->enabled)
 463                 return;
 464
 465         omap_dm_clk_disable(timer->iclk);
 466         omap_dm_clk_disable(timer->fclk);
 467
 468         timer->enabled = 0;
 469 }
 470 EXPORT_SYMBOL_GPL(omap_dm_timer_disable);
 471
 472 int omap_dm_timer_get_irq(struct omap_dm_timer *timer)
 473 {
 474         return timer->irq;
 475 }
 476 EXPORT_SYMBOL_GPL(omap_dm_timer_get_irq);
 477
 478 #if defined(CONFIG_ARCH_OMAP1)
 479
 480 /**
 481  * omap_dm_timer_modify_idlect_mask - Check if any running timers use ARMXOR
 482  * @inputmask: current value of idlect mask
 483  */
 484 __u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
 485 {
 486         int i;
 487
 488         /* If ARMXOR cannot be idled this function call is unnecessary */
 489         if (!(inputmask & (1 << 1)))
 490                 return inputmask;
 491
 492         /* If any active timer is using ARMXOR return modified mask */
 493         for (i = 0; i < dm_timer_count; i++) {
 494                 u32 l;
 495
 496                 l = omap_dm_timer_read_reg(&dm_timers[i], OMAP_TIMER_CTRL_REG);
 497                 if (l & OMAP_TIMER_CTRL_ST) {
 498                         if (((omap_readl(MOD_CONF_CTRL_1) >> (i * 2)) & 0x03) == 0)
 499                                 inputmask &= ~(1 << 1);
 500                         else
 501                                 inputmask &= ~(1 << 2);
 502                 }
 503         }
 504
 505         return inputmask;
 506 }
 507 EXPORT_SYMBOL_GPL(omap_dm_timer_modify_idlect_mask);
 508
 509 #elif defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) || \
 510                                 defined(CONFIG_ARCH_OMAP4)
 511
 512 struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer)
 513 {
 514         return timer->fclk;
 515 }
 516 EXPORT_SYMBOL_GPL(omap_dm_timer_get_fclk);
 517
 518 __u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
 519 {
 520         BUG();
 521
 522         return 0;
 523 }
 524 EXPORT_SYMBOL_GPL(omap_dm_timer_modify_idlect_mask);
 525
 526 #endif
 527
 528 void omap_dm_timer_trigger(struct omap_dm_timer *timer)
 529 {
 530         omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
 531 }
 532 EXPORT_SYMBOL_GPL(omap_dm_timer_trigger);
 533
 534 void omap_dm_timer_start(struct omap_dm_timer *timer)
 535 {
 536         u32 l;
 537
 538         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 539         if (!(l & OMAP_TIMER_CTRL_ST)) {
 540                 l |= OMAP_TIMER_CTRL_ST;
 541                 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 542         }
 543 }
 544 EXPORT_SYMBOL_GPL(omap_dm_timer_start);
 545
 546 void omap_dm_timer_stop(struct omap_dm_timer *timer)
 547 {
 548         u32 l;
 549
 550         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 551         if (l & OMAP_TIMER_CTRL_ST) {
 552                 l &= ~0x1;
 553                 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 554 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) || \
 555                         defined(CONFIG_ARCH_OMAP4)
 556                 /* Readback to make sure write has completed */
 557                 omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 558                  /*
 559                   * Wait for functional clock period x 3.5 to make sure that
 560                   * timer is stopped
 561                   */
 562                 udelay(3500000 / clk_get_rate(timer->fclk) + 1);
 563                 /* Ack possibly pending interrupt */
 564                 omap_dm_timer_write_reg(timer, OMAP_TIMER_STAT_REG,
 565                                 OMAP_TIMER_INT_OVERFLOW);
 566 #endif
 567         }
 568 }
 569 EXPORT_SYMBOL_GPL(omap_dm_timer_stop);
 570
 571 #ifdef CONFIG_ARCH_OMAP1
 572
 573 int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
 574 {
 575         int n = (timer - dm_timers) << 1;
 576         u32 l;
 577
 578         l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n);
 579         l |= source << n;
 580         omap_writel(l, MOD_CONF_CTRL_1);
 581
 582         return 0;
 583 }
 584 EXPORT_SYMBOL_GPL(omap_dm_timer_set_source);
 585
 586 #else
 587
 588 int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
 589 {
 590         int ret = -EINVAL;
 591
 592         if (source < 0 || source >= 3)
 593                 return -EINVAL;
 594
 595         clk_disable(timer->fclk);
 596         ret = clk_set_parent(timer->fclk, dm_source_clocks[source]);
 597         clk_enable(timer->fclk);
 598
 599         /*
 600          * When the functional clock disappears, too quick writes seem
 601          * to cause an abort. XXX Is this still necessary?
 602          */
 603         __delay(150000);
 604
 605         return ret;
 606 }
 607 EXPORT_SYMBOL_GPL(omap_dm_timer_set_source);
 608
 609 #endif
 610
 611 void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload,
 612                             unsigned int load)
 613 {
 614         u32 l;
 615
 616         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 617         if (autoreload)
 618                 l |= OMAP_TIMER_CTRL_AR;
 619         else
 620                 l &= ~OMAP_TIMER_CTRL_AR;
 621         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 622         omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
 623
 624         omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
 625 }
 626 EXPORT_SYMBOL_GPL(omap_dm_timer_set_load);
 627
 628 /* Optimized set_load which removes costly spin wait in timer_start */
 629 void omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload,
 630                             unsigned int load)
 631 {
 632         u32 l;
 633
 634         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 635         if (autoreload) {
 636                 l |= OMAP_TIMER_CTRL_AR;
 637                 omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
 638         } else {
 639                 l &= ~OMAP_TIMER_CTRL_AR;
 640         }
 641         l |= OMAP_TIMER_CTRL_ST;
 642
 643         omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, load);
 644         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 645 }
 646 EXPORT_SYMBOL_GPL(omap_dm_timer_set_load_start);
 647
 648 void omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable,
 649                              unsigned int match)
 650 {
 651         u32 l;
 652
 653         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 654         if (enable)
 655                 l |= OMAP_TIMER_CTRL_CE;
 656         else
 657                 l &= ~OMAP_TIMER_CTRL_CE;
 658         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 659         omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
 660 }
 661 EXPORT_SYMBOL_GPL(omap_dm_timer_set_match);
 662
 663 void omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on,
 664                            int toggle, int trigger)
 665 {
 666         u32 l;
 667
 668         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 669         l &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM |
 670                OMAP_TIMER_CTRL_PT | (0x03 << 10));
 671         if (def_on)
 672                 l |= OMAP_TIMER_CTRL_SCPWM;
 673         if (toggle)
 674                 l |= OMAP_TIMER_CTRL_PT;
 675         l |= trigger << 10;
 676         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 677 }
 678 EXPORT_SYMBOL_GPL(omap_dm_timer_set_pwm);
 679
 680 void omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler)
 681 {
 682         u32 l;
 683
 684         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 685         l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2));
 686         if (prescaler >= 0x00 && prescaler <= 0x07) {
 687                 l |= OMAP_TIMER_CTRL_PRE;
 688                 l |= prescaler << 2;
 689         }
 690         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 691 }
 692 EXPORT_SYMBOL_GPL(omap_dm_timer_set_prescaler);
 693
 694 void omap_dm_timer_set_int_enable(struct omap_dm_timer *timer,
 695                                   unsigned int value)
 696 {
 697         omap_dm_timer_write_reg(timer, OMAP_TIMER_INT_EN_REG, value);
 698         omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG, value);
 699 }
 700 EXPORT_SYMBOL_GPL(omap_dm_timer_set_int_enable);
 701
 702 unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer)
 703 {
 704         unsigned int l;
 705
 706         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_STAT_REG);
 707
 708         return l;
 709 }
 710 EXPORT_SYMBOL_GPL(omap_dm_timer_read_status);
 711
 712 void omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value)
 713 {
 714         omap_dm_timer_write_reg(timer, OMAP_TIMER_STAT_REG, value);
 715 }
 716 EXPORT_SYMBOL_GPL(omap_dm_timer_write_status);
 717
 718 unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer)
 719 {
 720         unsigned int l;
 721
 722         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_COUNTER_REG);
 723
 724         return l;
 725 }
 726 EXPORT_SYMBOL_GPL(omap_dm_timer_read_counter);
 727
 728 void omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value)
 729 {
 730         omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, value);
 731 }
 732 EXPORT_SYMBOL_GPL(omap_dm_timer_write_counter);
 733
 734 int omap_dm_timers_active(void)
 735 {
 736         int i;
 737
 738         for (i = 0; i < dm_timer_count; i++) {
 739                 struct omap_dm_timer *timer;
 740
 741                 timer = &dm_timers[i];
 742
 743                 if (!timer->enabled)
 744                         continue;
 745
 746                 if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) &
 747                     OMAP_TIMER_CTRL_ST) {
 748                         return 1;
 749                 }
 750         }
 751         return 0;
 752 }
 753 EXPORT_SYMBOL_GPL(omap_dm_timers_active);
 754
 755 int __init omap_dm_timer_init(void)
 756 {
 757         struct omap_dm_timer *timer;
 758         int i, map_size = SZ_8K;        /* Module 4KB + L4 4KB except on omap1 */
 759
 760         if (!(cpu_is_omap16xx() || cpu_class_is_omap2()))
 761                 return -ENODEV;
 762
 763         spin_lock_init(&dm_timer_lock);
 764
 765         if (cpu_class_is_omap1()) {
 766                 dm_timers = omap1_dm_timers;
 767                 map_size = SZ_2K;
 768         } else if (cpu_is_omap24xx()) {
 769                 dm_timers = omap2_dm_timers;
 770                 dm_source_names = omap2_dm_source_names;
 771                 dm_source_clocks = omap2_dm_source_clocks;
 772         } else if (cpu_is_omap34xx()) {
 773                 dm_timers = omap3_dm_timers;
 774                 dm_source_names = omap3_dm_source_names;
 775                 dm_source_clocks = omap3_dm_source_clocks;
 776         } else if (cpu_is_omap44xx()) {
 777                 dm_timers = omap4_dm_timers;
 778                 dm_source_names = omap4_dm_source_names;
 779                 dm_source_clocks = omap4_dm_source_clocks;
 780         }
 781
 782         if (cpu_class_is_omap2())
 783                 for (i = 0; dm_source_names[i] != NULL; i++)
 784                         dm_source_clocks[i] = clk_get(NULL, dm_source_names[i]);
 785
 786         if (cpu_is_omap243x())
 787                 dm_timers[0].phys_base = 0x49018000;
 788
 789         for (i = 0; i < dm_timer_count; i++) {
 790                 timer = &dm_timers[i];
 791
 792                 /* Static mapping, never released */
 793                 timer->io_base = ioremap(timer->phys_base, map_size);
 794                 BUG_ON(!timer->io_base);
 795
 796 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) || \
 797                                         defined(CONFIG_ARCH_OMAP4)
 798                 if (cpu_class_is_omap2()) {
 799                         char clk_name[16];
 800                         sprintf(clk_name, "gpt%d_ick", i + 1);
 801                         timer->iclk = clk_get(NULL, clk_name);
 802                         sprintf(clk_name, "gpt%d_fck", i + 1);
 803                         timer->fclk = clk_get(NULL, clk_name);
 804                 }
 805 #endif
 806         }
 807
 808         return 0;
 809 }